Boiler-furnace



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BOILER FURNACE. No. 570,998. I Patented Nov. 10, 1896'.-

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'BOILER FURNACE.

No. 570,998. Patented Nov. 10, 1896} INVENTOR WITNESSES UNITED STATES PATENT OFFICE SAMUEL P. HUTCHINSON, OF PHILADELPHIA, PENNSYLVANIA.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 570,998, dated November 10, 1896. Application filed December 23, 1895. Renewed October 16, 1896. Serial No. 609,160. (No model.)

To all whom it may concern/.-

Be it known that I, SAMUEL P. HUTCHIN- SON, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Steam- Furnaces; and I do hereby declare the following to be a sufficiently full, clear, and exact description thereof as to enable others skilled in the art to make and use the said invention.

This invention relates to furnaces for steamboilers for the smokeless combustion of hituminous coals and other fuels, and has for its object the more complete utilization of all the combustible parts of such fuel, the avoidance of smoke, and of the waste of unconsumed gases.

To this end this invention consists in a construction and proportioning of furnace, embracing a deflecting arch, an apparatus for heating air and delivering it to mingle with the gases generated under said arch, and an additional air supply, and means of heating and delivering the same above the fuel beneath the arch, and a steam jet or jets for supplying aqueous vapor or steam to the fuel and air entering beneath the grate.

The construction and operation of this invention is hereinafter fully described, and illustrated in the accompanying drawings, in which- Figure 1 shows a vertical lengthwise sectional elevation of a steam-boiler with this invention applied thereto. Fig. 2 shows a front elevation thereof; Fig. 3, a transverse section thereof in the plane indicated by the dotted line m min Fig. 1. Fig. 4 shows a horizontal section in the plane indicated by the line y y in Fig. 1, and Fig. 5 shows a like view with a modified form of the parts.

Referring to the drawings, 1 represents the boiler.

2 is the ash-pit.

3 is the door for closing the ash-pit.

4 is the grate, having a dead-plate 5 at the front end thereof and an inclined shelf 6 at the rear thereof.

7 is a bridge-wall beyond the inclined shelf 6,containing a chamber 8. The hollow bridge wall 7 has numeroussmall perforations 9 in the upper side.

10 are tubes receiving air from the front to heat the air and deliver it to the hollow bridge-wall.

11 are tubes or channels for receiving air and delivering it to the vertical heating-channels 12 in the side walls of the furnace'below the arch 13. The arch 13 is closed or imperforate at the front portion and has several series of openings 14 of gradually-increasing size toward the rear and a larger aperture 15 close to the bridge-wall 7. A tube 16 with small perforations is placed below the dead-plate 5 in the ash-pit 2, and a tube 17 is connected to the perforated tube 16, from which steam is discharged in minute jets below the dead-plate 5, whence it passes forward, and rises between the grates 4 into the fuel in front of the dead-plate 5.

Instead of openings 14 of gradually-increasing size through the arch 13 openings 14 of uniform size with decreasing intervals of space between them may be used, as shown in Fig. 5.

The boiler 1 may be of any of the usual forms. That shown in the drawings is of the kind known as the return tubular; but other formsmay be employed.

To use the furnace, a fire is started so as to cover the entire grate in the usual manner with kindling, then coal is added at the front in the dead-plate and as it is gradually consumed it is steadily pushed forward toward the rear. As the coal is supplied the heat is deflected by the imperforate portion of the arch 13 upon the fuel, and the hydrocarbon-vapors passing from such fuel in consequence of the heat deflected upon it combine with the hot-air jets from the perforations in the side walls and form combustible gas, which passing farther forward meets the combustible gases arising from the fuel in the grate partially consumed and divested of much of its hydrocarbon-gases as it passes rearward, so that when the fuel has reached the rear of the furnace all of the volatile hydrocarbons are exhausted and converted into gases and have passed through the series of graduated and the large terminal openings in the arch and burned with the air that is mingled with it from the rear apertures in the side Walls of the furnace. The principal volume of the gases rises at the larger opening at the rear of the arch and passes over the perforated bridge-Wall 7 Where it mingles with the highly-heated air and effects a thorough combustion With a commensurate, evolution of heat.

The gases thus thoroughly consumed pass under the boiler and return through the flues in the usual manner.

Having described my invention, What I claim is- I11 a steam generating furnace, an arch, placed above the fuel-chamber of the furnace, a grate, having a dead-plate at the front end, below said fuel chamber; series of graduallyincreasing sized openings in said arch, a 

